Calendar software

I am searching for a calendar system that will support:

1. Access to the calendar from my local system
2. Access to the calendar via the Internet
3. Provide multi-user support so we may share calendars via the Internet
4. Preferably would sync with Google, Outlook, and/or PDA

 

Not sure if this will do all that you want, but it certainly works with Outlook.

Outlook on the Desktop 1.2
http://www.majorgeeks.com/Outlook_on_the_Desktop_d5434.html
Main Features:
- Places fully functional Microsoft Outlook Calendar on your Desktop.
- The Oulook Calendar is pinned to your desktop so that no windows can get stuck behind it.
- The Calendar's position, size and opacity are all adjustable via a very intuitive GUI.
- A tray Icon is provided to get to the preferences or close the application if desired.

Limitations: Requires Microsoft .Net 2.0

Bazza